Bucksaw.



FREDERICK L. HEMMER, OF EAST ARLINGTON, VERMONT.

BUCKSAW.

Specification of Letters Patent.

Patented March 9, 1909.

Application filed July 31, 1.908. Serial No. 446,302.

To all whom it may concern:

Be it known that I, FREDERICK L. HEM- MER, a citizen of the UnitedStates, residing at East Arlin -ton, in the county of Bennington andState of Vermont, have invented certain new and useful improvements inBucksaws, of which the following is a specification.

The object of my invention is to provide a saw wherein certain parts areso constructed and arranged as to secure advantages not heretoforeobtained. In the use of saws of this character, especially when bringingthe blade in contact with the surface of an object, an extraordinarystrain is placed upon the cross bar and braces, sometimes resulting inthe buckling of the blade; To eliminate this objectionable feature, Ihave by means of a novel arrangement and construction of parts produceda saw capable of withstanding the strain placed upon the handles andbraces without danger of bending and thereby allowing the blade tobuckle.

For a full understanding of the invention and the merits thereof,reference is to be had to the following description and accompanyingdrawings, in which Figure 1 is a side elevation of my improved device,Fig. 2 is an enlarged detail sectional view taken through one of the endpieces and showing the method of connecting the tension and brace rodswith the end pieces, Fig. 3 is an illustration of the tension and. bracerod nuts and tie bar, and Fig. 4 is a transverse sectional view of thecross bar, spreader and band, taken on the line of Fig. 1.

Corresponding and like parts are referred to in the followingdescription and indicated in all the views of the drawings by the samereference characters.

Referring to the drawings, the numeral 1 designates an ordinary toothed.saw blade bolted or otherwise secured at both ends to the handles or endpieces 2, said handles being provided with squared flat portions 3 toform a suitable abutment for the squared flat end portions 4 of thecross bar 5. The cross bar 5 is made of any suitable material, the bodyportion of which is cylindrical in shape and is sawed, formed, orotherwise longitudinally divided into four equal parts between eachsquared end portion 4, as shown at 6.

The numeral 7 designates a transverse the squared end portions 4 andgives to each section of the cross bar a necessary amount of flexibilityfor the introduction of a spreader 8. Said spreader may be of anydesired construction with projections or arms 9 having tenons 10 thereonadapted to pass through corresponding openings 11 in a metal band 12.The arms or projections 9 when the spreader 8 is placed in positionprotrude through openings 6 in the cross bar 5 thereby forcing the foursections to assume the form of a trussed brace. The ends of the metalband 12 riveted or otherwise suitably fastened fits into the groove 7 inthe cross bar 5, the openings 11 passing over the tenons 10 therebyholding the spreader 8 rigidly in position. As before stated, in thisposition, the four sections of the cross bar 5 form a trussed brace andthe strain exerted transversely thereon by pressure applied to the endpieces 2 in either direction will be effectually taken up by therigidity of the cross bar.

The numeral 13 designates diagonally disposed brace rods provided withhooked end portions 14 adapted to be anchored in holes bored in one sideof the squared end portions 4 of the cross bar 5, and provided at theirother ends with threaded portions 13.

A metal band or clip 17 is placed around the upper ends of the endpieces 2 and held in position by a tie bar 18, the ends ofthe clipextending through openings 'm said tie bar and correspondingly locatedopenings 20 in the nuts 15 and 16, said clip 17 is turned or otherwiseprovided with heads 17 by means of which the nuts 15 and 16 are retainedthereon.

A tension rod 22 provided with threaded ends 22 one threaded right; theother left, extends across the saw frame at the top thereof and is heldin position by the right and left threaded nuts 15 as shown at openings23. The rod 22 is formed with outwardly curved portions 24 to provide ahandle by which said rod may be conveniently turned in either direction.It will be readily understood that with the parts threaded in the mannerdescribed, the rod 22 when turned in one direction by means of thehandle 24 the oppositely threaded nuts 15 draw the end pieces 2 towardeach other, thereby rigidly setting up the saw frame, and by a reversemovement knocking it down.

The numeral 25 designates an opening in the nut 16 into which the bracerods 13 are screwed or otherwise conveniently secured,

and an opening 26 of smaller diameter than the threaded ends 22 oftherod 22, forms a socket for said rod and by means of which the brace rods13 are held under tension.

With the arrangement of the several parts as shown, and especially bythe construction of the brace bar 5, the end pieces 2 are held againstmovement in relation to the other parts regardless of transverse strainplaced upon cross bar 5, brace rods 13, saw blade 1, and rod 22.

To set up the frame, the rod 22, after the brace bar is placed inposition, is turned in the direction whereby the right and left threadedends working in nuts similarly threaded will strain the upper portion ofthe end pieces 2 toward each other, and in this position the saw frameis effectively braced in all directions by the trussed brace formed bythe cross bar 5.

Having thus described the invention, what is claimed as new is:

1. A saw of the character described, comprising supporting end pieces, asaw blade connected thereto, brace rods secured to said end pieces andtending to draw the same together, a cross bar interposed between saidend pieces and abutting against the same, said cross bar being formedwith a longitudinally extending opening, and a spreader fitting in saidopening and exerting a lateral tension upon the parts of said cross bardefining said opening.

2. A saw of the character described, comprising supporting end pieces, ablade secured thereto, brace rods connected to said cross bar andexerting tension thereon to draw the same together, a cross barinterposed between said end portions and in abutting relation therewith,the said cross bar being formed with a longitudinally extending openingand a transverse groove formed in its exterior, a spreader fitting insaid opening and exerting a lateral tension on the portions of the crossbar defining said opening, and a band encircling said cross bar in saidgroove and connected to said spreader.

3. A saw of the character described, comprising supporting end pieces, ablade connected to said end pieces, brace rods secured to said piecesand tending to draw said end pieces together, a cross bar interposedbetween said end pieces and in abutting relation therewith, the saidcross bar being formed with two longitudinally extending openings formedtherein and intersecting each other, a cruci-form spreader the arms ofwhich are fitted in the respective openings and are formed at theirextremities with tenons, and a band encircling the cross bar and formedwith openings receiving said tenons.

4. A saw of the character described, comprising supporting end pieces, asaw blade secured thereto, a cross brace interposed between the endpieces with its ends engaging said end pieces near the middle of thelatter, said cross bar being formed at its ends with openings, bracerods formed at one end With hooked portions engaged insaid openings,said brace rods crossing each other, clips securing the upper ends ofsaid brace rods to the upper ends of the end pieces, and means forexerting a tension upon said brace rods.

5. A saw of the character described, comprising supporting end pieces, asaw blade secured thereto, a cross bar interposed between saidsupporting end pieces which abut thereagainst intermediate of theirends, brace rods connected to the opposite ends of the cross bar andextending upwardly in opposite directions, clips secured to the upperends of the end pieces, oppositely threaded nuts secured to said clipsrespectively, a tension bar formed with oppositely threaded ends workingthrough said nuts, and other nuts mounted on said clips and secured tothe upper ends of the respective brace rods, the tension bar bearingagainst said last named nuts, as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

rarnrrucr L. HEMMER. [n s]

